X-ray spectra of AGN are complex. X-ray absorption and emission features trace gas covering a wide range of column densities and ionization states. High resolution spectra show the absorbing gas to be outflowing, perhaps in the form of an accretion disk wind. The absorbing complex shapes the form of the X-ray spectrum while X-ray reverberation and absorption changes explain the spectral and timing behaviour of AGN. We discuss recent progress, highlighting some new results and reviewing the implications that can be drawn from the data.
The active galactic nucleus (AGN) phenomena results from a supermassive black hole accreting its surrounding gaseous and dusty material. The infrared (IR) regime provides most of the information to characterize the dusty structures that bridge from the galaxy to the black hole, providing clues to the black hole growth and host galaxy evolution. Over the past several decades, with the commissioning of various ground, airborne and space IR observing facilities, our interpretations of the AGN circumnuclear structures have advanced significantly through improved understanding of how their dust emi…
We present Atacama Large Millimeter/submillimeter Array observations of a radio-loud and millimeter-bright galaxy at z=2.6. Gravitational lensing by a foreground galaxy at z~0.2 provides access to physical scales of approximately 360 pc, and we resolve a 2.5 kpc-radius ring of star-forming molecular gas, traced by atomic carbon CI(1-0) and carbon monoxide CO(4-3). We also detect emission from the cyanide radical, CN(4-3). With a velocity width of 680 km/s, this traces dense molecular gas travelling at velocities nearly a factor of two larger than the rotation speed of the molecular ring. While…
Young Star Clusters In The Circumnuclear Region Of NGC 2110
近红外高分辨率观测显示，在塞弗特1号NGC 2110的活动星系核（AGN）周围有星团，在其核周围有一个90 x 35 pc的冲击气体物质棒。这些都是第一次看到我们的成像和气体运动学的中央100 pc与凯克OSIRIS仪器与自适应光学。这些星团中的每一个都比靠近银河系中心的拱门星团亮2-3倍。核心恒星形成率（SFR）为0.3 M $_\odot$ /年。光电离气体（He I）动力学意味着封闭质量为3-4 x 10 $^8$ M $_\odot$。这些观测结果证明了活动星系核反馈（触发大质量星团中的恒星形成）与由此产生的恒星风（和SNe）之间的物理联系，后者导致观测到的[Fe II]发射并为黑洞提供能量。
The molecular circumnuclear disk (CND) in Centaurus A: A multi-transition CO and [CI] survey with Herschel, APEX, JCMT, and SEST
我们介绍了赫歇尔空间天文台以及SEST、JCMT和APEX对NGC 128（Centaurus~A）中心致密环核盘的新CO和C^o线测量结果。Cen A中心的CO阶梯与星暴星系或活动星系核的CO阶梯有很大的不同。此外，Cen A [CI]中心发射线的相对强度也比其它星系的强得多。在同一视线范围内，致密的环核盘（CND）的CO表面亮度明显高于伸展得多的薄盘（ETD）。我们的LVG和PDR/XDR模型表明，如果通过紫外光子加热，则大部分CND气体相对较冷（25 - 80 K）且密度不高（~ 300 cm^{-3}），尽管在CND和ETD中都存在一些密度高得多的气体，其密度约为30 000 cm^{-3}。最后，在CND中也有高激发、高密度相（但在ETD中没有），要么是极端PDR的形式，但更可能是XDR的形式。Cen A CND的总气体质量为8.4 x 10^{7} M（太阳），不确定系数为2。CO-H2转换系数为4 x 10^{20} K km/s，也在2倍以内。
